Jarring tool



Dec. 9, 1952 c. o. DENNING 2,621,025

JARRING TOOL Filed Dec. 27, 1947 3 Sheets-Sheet l slln C. O. DENNING JARRING TOOL Filed Dec. 27, 1947 3 Sheets-Sheet 2 v I 0O 4 2 5 W H W 6 M W 4:17 I z 8 m 8 I 2 8 7//// Q: 7

v 2 3. n 4 H M M m C O a l 4 z a w 2 V b. n. w

M .M H MV 5 m m m r w 3 Sheets-Sheet 3 c. O. DENNING JARRING TOOL U N R a v w Filed Dec. 27, 1947 Patented Dec. 9, 1952 JARR'iNG TOOL,

Charles 0. Denning,3Houston} flxfi assigfior to A-l Bit zit-Tool Company, -Inc.,' Houst'om-Tex'J a corporation of Texas Application"December'27, 1947, SerialNoJ79' L153 This invritionrelates 'to a jarring tool. An-obj-ect-of the invention is toprovide 'a tool which-is shaped to be lowe'red-into-a well bore and gis engageablewith an object'stuck in-the bore andwhereby vibrations may be successively imparted J a to the stuck object and the object thus jarred loose and removed'irom the bore."

It is another object of the inventionto provide I a jarring tool ofth'echaracter described which is of such construction that well fluid may be force'd through-it soas to -maintain the necessary" circulation."

It'is a furtherobject of the invention to providea tool of thecharacter described-which may be easily reset after'a stroketo'the end that-as many successive strokes as desired may-be delivereduntil the stuck object is jarred-loose."

On'ejformof the tool is specially designed for operation -'by a wire linewhile another form'has' I been designed to be operated by a drill stem as willbemore specificallyhereinafter explained.

Other objects and advantages will be apparent from the following-specification which is illustrated by the accompanying drawings, wherein- Figure 1 is "a verticahsectional view-of the 7 upper end of the tool in engaged-position=prep-' aratory-to taking *a stroke,

Figure 2 is a vertical, sectional view ofthe lower Figure 3 is "an enlarged, cross-sectionaiview" taken-onthe line 3-3 of Figure 1.-

Figure 4 is an enlarged cross sectional' view taken on the line 4-4 of Figure 2.

Figure 5 isa vertica'l, sectional view of the upper'-' end of the tool with the parts in initia'l upstroke position;

Figure 6 is a vertical, sectionalview'of the lower end thereof;

Figure '7 isa side elevation partly in'section oi the complete tool inengagement with the stuck object.

Figure '8 is a vertical, sectional view of the:-

upper "end of the tool designed to be operated'by a drill stem. v

Figure '9 is a vertical, sectional view ofthe lower end thereof and FigurelO is *a sideelevational view, partlyin 1 cross-section showing the grappling tool of the' invention engaged with a stuck pipe.

Referrihgnow more' particularly to the form 1 shown in-Figures "1 to '7 inclusive, the numeral I designates the jar stem housing threaded 'into'."

the upper end of which there is an impacthead,

or anvil; 2.-

Screwed-intothe lower end of the housing there is fa coupling 3 whose lower end" is reduced-dri diameter and downwardly and -inward1y-tapered j forming a latch expander 4;

There "is a tubular-latchhousing 5 -whose up'pei'" "end is scre'wedonto the lower'endof the coupling 3. The 'lower end of this latchhousingisre duced and externally threaded and screwed-0mm said reduced lower end-and depending therefrom there is tubular spring housing 6 whose-lower"' end terminatesinareduced' externallythfeaded Working axially through'the jar ste'm'housing I there is-a jar stem -8 and on'this stem,- and preferably formed integrallytherewith and 1o'- cated'inthe-housing i there is the jar'ha'mmer' 9.

Beneath-thishammer-the stem 8 is reduced and extends on down" axially through the coupling 3 and withinsa'idcoupling "the stem' is provided with the guides 10 which are spaced apart around the stem-yas shown-in Figure3,to'provide'circulating'spaces-i I-.

The lower end of the jar stem terminatesinan inverted conical shaped head i 2."

Sli'dable axially through the reduced lower end"- of thelatch housing-5 there-is a latchstenr I3 whichleiitends down into -the'-'springhousing 6.

Scre'wedonthelower end-of thestem' 13 there?" is a nutl 4 which is maintained*agalnstdeta'ch ment' by a locknutl 5 and surrounding the stem"; I 3 and interposed between the nut-14' and the lower end of the-latch housingthereis a strong" coil spring [6.

There'is alat'ch 'designated'generally byithe""' numeral I I in-the latch housingiand'whose lower" end is screwed onto th'eupper end of the latch stem l3.-= The upper end ofthe-latch isverticallyslitted thusproviding a plurality of' flex ible'latch arms 18. The upper ends-of thesearms are inwardly thickened forming-the-catches I9 whose upper ends are 1 formed with" the up wardlylflared faces'20Iwhich are normally spaced beneath the latch expander V 4;

The housings ,l,- 5 and -6 are prov-ided with. J radialopenings,- as 21, -and:circu1ation may-bemaintained through these; openings and through.

the circulating spaces l'l The tool may .be lowered into the well by means of afiex'ibl'e line whose lower end is connected to the socket 22 which; intur'n, is attached to the 1 upper end of the jar stem 8.

Any selected'typ'e ofgrappling tool, such as 23,

may be attached to the pin 1, as shown inFigure' '7. This grappling tool is of a design to-readily ngage over the head24 which iscarried by the upper end of the conventional-side wall -co'r'e bar w rel, the tool herein described being particularly designed for engaging with and removing core barrels that may become stuck in the well bore; although any conventional type of grapple may be provided that will readily take hold of any object, such as pipe or the like, that may become stuck in the well bore.

When the tool is lowered into the well bore and engaged with the stuck object the latch I! will hang on the head [2, as shown in Figures 1 and 7, with the upwardly flared faces of the latch arms spaced beneath the lat-ch expander.

An upward pull may then be taken on the line causing a relative upward movement of the jar stem, the latch and the latch stem thus placing the spring [6 under compression.

As the latch moves upwardly its faces 20 will come into contact with the tapering face of the expander 4 and thus gradually expand the latch arms and eventually the catches I9 will be disengaged from the head [2 thus allowing an instantaneous upward movement of the jar stem 8 and the hammer 9 will strike the lower end of the anvil 2 with a sudden impact thus creating a sudden upward movement of the housings and the grappling tool 23 which will be imparted to the stuck object.

This operation may be repeated as often as necessary by merely lowering the jar stem until the head 12 is beneath and in engagement with the catches [9 of the latch arms whereupon another upward pull may be taken as before and the process repeated as often as necessary to jar loose the stuck object.

Referring now to the form of tool illustrated in Figures 8, 9 and 10, this type is designed to be attached to and operated by a conventional drill stem, as 25, to whose lower end the coupling 26 is attached and the jar stem 8a has its upper end connected to this coupling 26. This stem 8a is tubular throughout having the fluid channel 21 extending through it from end to end and leading from the channel through the drill stem. The jar stem 8a is provided with the jar hammer 9, as shown in the other figures, and incorporated in said stem there is the conical shaped head l2a corresponding in location and use to the head I! but said stem 8a is extended beneath said head, as shown in Figure 9. It extends on down into the latch stem l3a which in Figures 8, 9 and I is of tubular formation and surrounding the lower end of the jar stem 8a there is a seal ring 28 which forms a seal between the jar stem and the latch stem 13a; also in this form of the tool the lower end or pin Ta of the spring housing 6:: is of tubular formation and the latch stem I3a is extended down into it and sealed with the lower 1 end of said spring housing by means of the annular seal 29.

In this embodiment of the tool there is shown a tapering tap 30 which is attached to the lower end of the spring housing Ga and which is adapted to be screwed into the stuck pipe 3| which is to be pulled. This tap has a fluid passageway 32 therethrough and fluid may be circulated downward through the tool and through the stuck pipe 3| and back up around said pipe to, in some cases, wash it loose to facilitate its removal.

In other respects the type of tool shown in Figures 3, 9 and is similar to that shown in Figures 1 to '7, inclusive.

There has been shown and described what are now considered to be preferred forms of the invention by way of illustration only while the broad 4 principle of the invention will be defined by the appended claims.

What I claim is:

l. A jarring tool comprising, a housing structure, means for connecting said structure to a stuck object, an anvil carried by the housing structure and having an impact face, an axial stem slidable in said structure, means connecting the stem to a fishing string, a hammer on the stem opposing, and spaced from, said face, latch means in the housing structure in releasable engagement with the stem and having a tapering face, a yieldable member operatively disposed between the housing structure and stem and adapted to be placed under compression upon application of tension to the stem and an expander fixed with respect to the housing and positioned to engage said face to release the latch means from the stem, upon application of such tension, to allow the hammer to strike the anvil face, under the infiuence of such tension, to create a jar.

2. A jarring tool adapted to be lowered into a well and comprising, a housing structure, means for connecting said structure to an object stuck in a well, an impact face carried by the housing structure, an axial stem slidable in said structure, means connecting the stem to a fishing string, a hammer on the stem opposing, and spaced from, said face, opposing flared latch means in the housing structure in releasable engagement with the stem, a yieldable member operatively disposed between the latch means and housing structure and arranged to be placed under compression upon application of tension to the stem and an expander arranged to engage within the latch means for releasing the latch means from the stem, upon application of such tension to allow the hammer to strike said face, under the influence of such tension, to create a jar.

3. A jarring tool for wells comprising, a housing structure, means for connecting said structure to an object stuck in a well, an anvil carried by the housing structure and having an impact face, an axial stem slidable in said structure, means connecting the stem to a fishing string, a hammer on the stem opposing, and spaced from, said face, expansible latch means in the housing structure in releasable engagement with the stem and having tapering faces, a yieldable member operatively disposed between the housing structure and the latch means and arranged to be placed under compression by movement of the latch means, upon application of tension to the stem, and an expander fixed relative to the housing and forming means arranged to engage said faces for releasing the latch means from the stem, upon such movement of the latch means, to allow the hammer to strike the anvil face, under the influence of such tension, to create a jar.

4. A jarring tool for recovering a stuck object from a well and having one end thereof connectable to an operating string and the other end thereof to the stuck object, said tool comprising: an elongated housing; a stem mounted for longitudinal slidable movement therein and projecting from one end thereof; an anvil carried by said housing; a hammer carried by said stem in longitudinal spaced opposition to said anvil for contact therewith upon predetermin d relative extensible movement between said housing and said stem; latch carrying means mount ed for longitudinal slidable movement in said housing; at least one latch finger carried by said means and retainingly engageable with said stem in a relative contracted position of the latter with respect to said housing; means carried by said housing for engaging and positively unlatching said latch finger to release said stem upon predetermined relative extensible movement between the latter and said housing less than said first mentioned relative movement; and resilient means engaged with said latch carrying means and said housing for opposing relative extensible movement between said housing and said stem when the latter is engaged by said latch finger.

5. The structure defined in claim 4 in which the resilient means comprises a compression coil spring.

6. The structure defined in claim 4 in which the stem has a shoulder thereon; the latch carrying means carries a plurality of annularly arranged spring latch fingers having outwardly tapering end portions and inwardly extending catches for engagement with said shoulder; and the unlatching means comprises a complementary tapered annular projection for engagement with the inner surfaces of said finger end portions to cam the latter radially outwardly.

7. A jarring tool for recovering a stuck object from a well and having one end thereof connectable to an operating string and the other end thereof to the stuck object, said tool comprising: an elongated housing having a fluid opening at one end thereof; a tubular stem mounted for longitudinal slidable movement in said housing and projecting from the other end thereof; an anvil carried by said housing; a hammer carried by said stem in longitudinal spaced opposition to said anvil for contact therewith upon predetermined relative extensible movement between said housing and said stem; tubular latch carrying means mounted for longitudinal slidable movement in said housing, the inner end of said stem being sealingly telescoped within one end of said latch-carrying means and the other end of the latter being sealingly telescoped within said housing opening, whereby said housing, latchcarrying means and stem provide a passageway for conducting fluid longitudinally through the tool; at least one latch finger carried by said means and retainingly engageable with said stem in a relative contracted position of the latter with respect to said housing; means carried by said housing for engaging and positively unlatching said latch finger to release said stem upon predetermined relative extensible movement between the latter and said housing less than said first mentioned relative movement; and resilient means engaged with said latch carrying means and said housing for opposing relative extensible movement between said housing and said stem when the latter is engaged by said latch finger.

CHARLES 0. DENNING.

REFERENCES CITED The following references are of record in the file of this patent:

UNITED STATES PATENTS Number Name Date 1,849,879 McCullough Mar. 15, 1932 2,016,607 McCullough Oct. 8., 1935 2,022,138 McCullough Nov. 26, 1935 2,126,241 Black Aug. 9, 1938 2,166,299 Kennedy et 'al. July 18, 1939 2,302,856 Hamon Nov. 24, 1942 2,425,012 Snyder Aug. 5, 1947 FOREIGN PATENTS Number Country Date 486,763 France Feb. 14, 1918 

